Hi guys thanks, I picked up a haynes and a multi tester.... everything was within range (iat, ect, o2) the only thing i couldn't test was the map sensor as i didn't have a way to induce vacuum on it.
I replaced the cap and rotor as on further inspection I saw my current rotor was starting to get corroded.
The thing i'm noticing now is a distinct clicking or tapping sound coming from the distributor. Using the "screwdriver" stethoscope it's loudest at the middle of the cap... what on earth could that be? I removed the cap several times to check for any possible contact on the rotor; there was none. It's the same frequency as the valves/ injectors (which are all clicking as they should btw) however its MUCH more pronounced.
Same distributor just different cap and rotor; didn't click before and now does.... no signs of anything hitting...